DRV8818PWPR

The DRV8818 provides several internal shutdown functions for protection purposes. These include Undervoltage Lockout (UVLO), Overcurrent Protection (OCP), and Thermal Shutdown (TSD) [2]. 1. Undervoltage Lockout (UVLO): If the voltage on the VM or VCC pins falls below the undervoltage lockout threshold, all circuitry in the device will be disabled, and the indexer will be reset to the homestate. Operation will resume when VM and VCC both rise above their UVLO thresholds [2]. 2. Overcurrent Protection (OCP): If the current through any FET exceeds the preset overcurrent threshold, all FETs in the H-bridge will be disabled for a period of approximately 800µs, or until certain conditions are met. Overcurrent conditions are sensed in both directions, and various scenarios like a short to ground, supply, or across the motor winding will result in an overcurrent shutdown [2]. 3. Thermal Shutdown (TSD): If the die temperature exceeds safe limits, all drivers in the device are shutdown, and the indexer is reset to the homestate. Once the die temperature has fallen to a safe level, operation resumes [2]. These internal shutdown functions ensure the protection and safe operation of the DRV8818 motor driver. [2]

The purpose of the DRV8818 IC is to provide an integrated stepper motor driver solution for printers, scanners, and other automated equipment applications. It consists of two H-bridge drivers and microstepping indexer logic to control a stepper motor. The device has N-channel power MOSFETs configured as full H-bridges to drive the motor windings, allowing for easy interfacing to controller circuits in various step modes such as full-step, half-step, quarter-step, or eighth-step. The DRV8818 also features programmable decay mode and PWM off-time, along with internal shutdown functions for protection against overcurrent, short circuit, under-voltage lockout, and overtemperature. [2]

The DRV8818 is packaged in a PowerPAD™ 28-pin HTSSOP package with PowerPAD™ [2]. The available ordering options are as follows: - Reel of 2000: DRV8818PWPR - Tube of 50: DRV8818PWP [2].